Yes, some plastic dishes can go in the dishwasher when labeled dishwasher safe and placed away from the heating element.
Plastic plates, cups, and food containers make kitchen clean-up easier, but hot water and strong detergent can be tough on them. One load on a harsh cycle can leave lids warped, containers cloudy, or worse, send tiny plastic pieces into your food. So the real question is not only “can I put plastic in the dishwasher?” but also “when is it smart to do it?”
This guide walks through how dishwashers affect different plastics, how to read symbols and recycling codes, and when experts suggest handwashing instead. By the end, you’ll know exactly which plastics can ride on the top rack, which should stay in the sink, and how to keep both your dishes and your family safer over many wash cycles.
Can I Put Plastic In The Dishwasher? Main Rules
The short version: plastic can go in the dishwasher only when the item is designed for high heat and clearly marked as dishwasher safe. Even then, it belongs on the top rack, away from the heating element. Thin takeout tubs, old containers, and mystery plastics with no marking are better washed by hand or replaced with tougher options like glass.
| Plastic Type / Code | Common Uses | Dishwasher Guidance |
|---|---|---|
| PET / #1 | Soda bottles, some salad dressing bottles | Skip the dishwasher; heat can speed up wear and particle release. |
| HDPE / #2 | Milk jugs, some sturdier food containers | Check for a dishwasher safe mark; top rack only if labeled. |
| PVC / #3 | Occasional cling wrap, specialty packaging | Keep out of the dishwasher; choose alternatives for food contact. |
| LDPE / #4 | Soft squeeze bottles, some lids | Only wash if labeled dishwasher safe; top rack, cooler cycle. |
| PP / #5 | Reusable food containers, many microwave-safe tubs | Often dishwasher safe when labeled; still use top rack. |
| PS / #6 | Disposable cutlery, foam cups | Not suited to dishwashers; can warp and shed fragments. |
| Other / #7 | Mixed resins, some hard plastics and clear bottles | Follow the exact marking; if unsure, wash by hand. |
| Silicone (no standard code) | Baking mats, flexible lids, snack bags | Often dishwasher safe on top rack when labeled as such. |
This chart gives a first pass, but it does not beat the wording or symbol on the product itself. When an item says “dishwasher safe” or shows a clear dishwasher icon, that signal has more weight than the resin code alone.
When The Answer Is Mostly Yes
Plastic food containers and dishes that come from well-known brands and ship with “dishwasher safe” on the bottom are usually fine on the top rack. Many sturdy polypropylene (#5) containers, children’s plates, and reusable cups fall into this group. Still, they can wear out over time: watch for warping, peeling prints, or deep scratches and retire pieces that start to break down.
When You Should Wash Plastic By Hand
Thin deli tubs, single-use yogurt cups, takeout containers, and unlabeled storage boxes do not handle the heat or strong spray inside a dishwasher. The American Academy of Pediatrics, through its HealthyChildren.org guidance, advises families to wash plastic food containers by hand instead of running them through high-heat cycles, to cut down on chemical migration into food. That advice lands even harder for baby items and containers used for hot meals.
Dishwasher Risks For Plastic Dishes And Containers
Dishwashers clean with a mix of hot water, detergent, and strong spray. That mix is great for baked-on food, but plastic is softer than glass or steel, so it reacts differently. Two main issues show up over time: physical damage, such as warping and cracks, and chemical changes that send small fragments or additives into food and rinse water.
Heat, Warping, And Cracks
Dishwasher water can reach around 120–160°F, and drying cycles can push temperatures even higher near the heating element. Pieces on the bottom rack sit closer to that heat and feel more of it. Plastic that was never meant for such temperatures can sag, twist, or grow hairline cracks. Even plastic labeled “top rack only” can deform if it falls through the rack or if a cycle runs hotter than usual.
Warped lids no longer seal tightly. Cracks trap food and detergent that are hard to rinse away. Both problems shorten the life of the container and create new surfaces where germs can cling between washes.
Chemical Leaching And Microplastics
Beyond visible damage, repeated heating can change the way additives and small particles move inside plastic. Research and consumer testing reports have raised concerns that more heat and more wear mean more plastic pieces and chemicals slipping into food and dishwater. Some studies find that heating food contact plastics, including in dishwashers, increases the release of microplastics and certain plasticizers.
Because of these findings and similar work on bisphenols and phthalates, groups such as the American Academy of Pediatrics encourage parents to favor glass or stainless steel for hot foods and to avoid running plastic food containers through hot cycles whenever possible. That does not mean every plastic container washed once is unsafe, but it does point toward choosing cooler settings and swapping in non-plastic options where you can.
How To Check If A Plastic Item Is Dishwasher Safe
The safest way to answer “can I put plastic in the dishwasher?” for one specific bowl or container is to read the markings on the bottom. Most modern items show either words, a symbol, or both. When in doubt, assume handwash only rather than guessing.
Read Labels And Dishwasher Symbols
Turn the item over and look for words like “dishwasher safe” or “top rack only.” Many brands also use icons. Common dishwasher safe symbols show plates or glasses with water drops or diagonal lines above them. An article from Maytag explains several common dishwasher safe symbols and notes that “top rack only” icons mean the item should never sit near the heating element.
If you see a symbol that looks like dishes with a big “X” over them, or wording such as “hand wash only,” keep that piece out of the dishwasher even if it feels sturdy.
Use Recycling Codes As A Backup Clue
Recycling codes are not dishwasher ratings, but they can help when brand markings are missing. Containers made from polypropylene (#5) and some HDPE (#2) tend to handle heat better than containers made from PET (#1) or polystyrene (#6). Still, two containers with the same code can behave differently, so a resin code should never override a clear “hand wash only” mark.
When there is no dishwasher symbol and only a recycling triangle, treat the container as lower-confidence for machine washing. If it holds hot soups, stews, or breast milk, lean toward handwashing or using glass.
What To Do When There Is No Marking
Older containers and cheap takeout boxes often have no clear symbols. In that case, use common sense. Thin walls, glossy printed logos, and lids that already feel loose are all signs that the box will not survive repeated hot cycles. Save those pieces for cold, short-term storage or single-use tasks, or skip reusing them altogether.
For items that matter a lot to you, such as favorite kids’ dishes or specialty storage sets, check the brand’s website or packaging page. Many brands post care directions online even when the molded lettering under the item is hard to read.
Can I Put Plastic In The Dishwasher? Practical Kitchen Rules
If you still ask yourself “can i put plastic in the dishwasher?” while loading the racks, a short checklist can help. Run through it each time you add a new container or cup. After a few weeks, the habit becomes automatic and your risk of ruined containers or unwanted plastic in food drops sharply.
Simple Do’s Before You Press Start
- Check the bottom of every new plastic item for clear wording or a dishwasher symbol.
- Place all plastic on the top rack so it sits farther from the heating element.
- Use a normal or eco cycle instead of the hottest sanitizing setting when washing plastic.
- Face lightweight lids and cups so they cannot flip and fall onto the bottom rack.
- Pull out any piece that starts to look cloudy, warped, or badly scratched.
Things To Keep Out Of The Dishwasher
- Disposable deli tubs and takeout soup containers, even if they survived one load before.
- Thin plastic cups from parties or stadiums.
- Baby bottles and sippy cups that lack a clear “dishwasher safe” mark from the maker.
- Plastic utensils with printed designs that start to fade or flake.
- Any container that smells odd after washing or has greasy spots that never rinse clean.
| Plastic Item | Dishwasher Advice | Main Reason |
|---|---|---|
| Brand-name storage set labeled “dishwasher safe” | Top rack, normal heat; skip high-heat dry. | Designed for higher temperatures but still ages over time. |
| Takeout soup container | Wash by hand or avoid reuse. | Thin walls and unknown resin blend. |
| Children’s plate marked “top rack only” | Top rack only; spread away from heating element. | Closer contact with heat can warp the plate. |
| Reusable water bottle with no markings | Handwash until you confirm maker directions. | Unknown heat tolerance and coating. |
| Microwave-safe PP (#5) lunch box | Often safe on top rack; cooler cycle preferred. | Better heat resistance; still watch for wear. |
| Foam cup or thin PS (#6) plate | Keep out of the dishwasher. | Soft foam can melt, dent, and shed particles. |
| Silicone baking mat labeled dishwasher safe | Top rack or rolled on upper level. | Silicone holds up well but can trap grease. |
This kind of checklist turns a vague question like “can i put plastic in the dishwasher?” into a quick sort. Each item either has a clear green light, a clear red light, or lands in a “check the brand site” middle zone.
Safer Alternatives To Dishwashing Plastic
One way to cut risk from heating plastic is to rely on other materials for hot food, strong detergent, or long soaks. A small shift in what you buy for leftovers and kid meals can slice down how much plastic runs through high-heat cycles in your kitchen.
Glass Containers
Glass storage containers handle dishwashers and microwaves well when they come from reputable brands and are used as directed. Lids are usually plastic or silicone, so those still need careful placement on the top rack, but the main body of the container does not break down in the same way as plastic. Glass also does not absorb stains or odors from tomato sauce or curry.
Stainless Steel Options
Steel lunch boxes, cups, and bowls offer a tough option for both kids and adults. Many are dishwasher safe and can sit anywhere in the machine. They can dent if dropped, yet they do not warp, melt, or release plastic fragments. For hot coffee and tea, double-walled steel mugs cut down on plastic lids and straws.
Silicone Bags And Lids
Food-grade silicone can be a good middle choice for snack bags and stretch lids. When marked dishwasher safe, these items can go on the top rack. Silicone is still a polymer, so it is not free of all concerns, but it tends to hold up better under repeated heating than many thin plastics.
Main Takeaways For Washing Plastic In The Dishwasher
Dishwashers and plastic can mix, but only with the right pieces and settings. Look for clear “dishwasher safe” wording or symbols, favor the top rack, and pick cooler cycles whenever you wash plastic. Treat unlabeled, thin, or worn containers as handwash items or step up to glass or steel for hot food.
Health groups that study children’s exposure to chemicals encourage families to cut down on heated plastic around food and drinks. Their advice lines up well with what appliance guides say: use the dishwasher for sturdy, clearly labeled pieces, and give the rest a gentle wash by hand. If you follow that rule of thumb, your containers last longer, and your dishes, leftovers, and lunch boxes stay in better shape load after load.
